ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
  • Weitere Quellen  (934)
  • COMPUTER PROGRAMMING AND SOFTWARE  (434)
  • SOLAR PHYSICS  (288)
  • MECHANICAL ENGINEERING
  • 1990-1994  (934)
  • 1970-1974
  • 1990  (934)
Sammlung
  • Weitere Quellen  (934)
Datenquelle
Schlagwörter
Erscheinungszeitraum
  • 1990-1994  (934)
  • 1970-1974
Jahr
  • 1
    facet.materialart.
    Unbekannt
    Future solar system missions (1990)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: NASA's planetary exploration program is discussed, with emphasis on strategy, namely, exploration of all three main classes of solar system bodies (the terrestrial planets, the outer giants and their moons, and the primitive small bodies). Planning of an extensive search for other planetary systems is focused on the application of various approaches to ultra-high precision astrometry and the possible use of a space-based coronagraphic telescope. Program strategy and lunar and Mars outpost precursor missions are illustrated.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: In: Observatories in earth orbit and beyond (A93-23401 07-89); p. 297-306.
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unbekannt
    Robotics technology discipline (1990)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: Viewgraphs on robotics technology discipline for Space Station Freedom are presented. Topics covered include: mechanisms; sensors; systems engineering processes for integrated robotics; man/machine cooperative control; 3D-real-time machine perception; multiple arm redundancy control; manipulator control from a movable base; multi-agent reasoning; and surfacing evolution technologies.
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: Technology for Space Station Evolution. Executive Summary and Overview; p 197-233
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 3
    facet.materialart.
    Unbekannt
    Models of material ejection (1990)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: Some recently developed models related to the formation of a coronal mass ejection (CME) are reviewed. The models individually consider the stability of a prominence, the eruption of a coupled prominence and CME configuration with driven reconnection below the prominence, magnetic arcade equilibrium, and coronal evolution due to shear motion. No effort is made to critique the various models. Their relevance to actual observed material ejections will ultimately be determined by detailed comparison with present and future observations.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: ; 14 p.|Flares 22; Oct 01, 1990; Chantilly; France
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 4
    facet.materialart.
    Unbekannt
    A new twist to the solar cycle (1990)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: Recent numerical simulations of magnetic buoyancy instabilities suggest a new mechanism for the variation with the solar cycle in the scale and structure of surface magnetic flux. The nonlinear evolution of a predominantly toroidal field is found to depend crucially on the distribution of the weaker poloidal ingredient. For certain field configurations large, helical magnetic fragments are produced; for others the escaping field is small-scale and untwisted. We propose that the observed structural variations in flux may be accounted for by small changes in the twist of a deep-seated field. The large fragments will appear at the surface as active regions, which dominate at solar maximum, while the small-scale field will emerge as ephemeral regions which constitute practically all of the flux at solar minimum.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Royal Astronomical Society, Monthly Notices (ISSN 0035-8711); p. 6P-9P.
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 5
    facet.materialart.
    Unbekannt
    Effects of the driving mechanism in MHD simulations of coronal mass ejections (1990)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: Results of time-dependent MHD simulations of mass ejections in the solar coronal are presented. Previous authors have shown that results from simulations using a thermal driving mechanism are consistent with the observations only if an elaborate model of the initial corona is used. The first simulation effort, using a simple model of a plasmoid as the driving mechanism and a simple model of the initial corona, produces results that are also consistent with many observational features, suggesting that the nature of the driving mechanism plays an important role in determining the subsequent evolution of mass ejections. First simulations are based on the assumption that mass ejections are driven by magnetic forces.
    Schlagwort(e): SOLAR PHYSICS
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 6
    facet.materialart.
    Unbekannt
    Helical flux ropes in solar prominences (1990)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: The present numerical method for the computation of force-free, cancelling magnetic structures shows that flux cancellation at the neutral line in a sheared magnetic arcade generates helical field lines that can support a prominence's plasma. With increasing flux cancellation, the axis of the helical fields moves to greater heights; this is suggestive of a prominence eruption. Two alternative scenarios are proposed for the formation of polar crown prominences which yield the correct axial magnetic field sign. Both models are noted to retain the formation of helical flux tubes through flux cancellation as their key feature.
    Schlagwort(e): SOLAR PHYSICS
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 7
    facet.materialart.
    Unbekannt
    Basic properties and models of solar prominences (1990)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: Prominences are relatively cool (10,000 K) and dense plasma clouds which may persist for 100 days or more in the midst of the much hotter (1 million K) and more tenuous (10 exp 9/cu cm) corona. Many observations imply that the magnetic field in and around prominences is responsible both for isolating prominences from the corona and for supporting them against gravity. It is not at all obvious how the magnetic field can do both these tasks, but the limited theoretical models that are available suggest that a magnetic-flux rope is involved. Using a new analytical model, it is argued that the flux rope could also play a key role in the eruption of a prominence by supplying the magnetic energy necessary to drive the prominence outwards.
    Schlagwort(e): SOLAR PHYSICS
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 8
    facet.materialart.
    Unbekannt
    Dynamics of axisymmetric loops (1990)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: Time-dependent, 2D MHD simulations in cylindrical geometry are presently employed to study the evolution of a solar magnetic loop in response to rotation within circular sections at the loop ends. While the magnetic energy initially increases as time-squared, and the solution fluctuates at a characteristic loop frequency, the average kinetic energy subsequently increases rapidly and levels off at a higher value that is still substantially lower than the magnetic energy release. Magnetic energy thenceforth increases exponentially with time, and deviations from a force-free field begin to appear. Finally, the current and field are no longer force-free, and the solution becomes highly nonlinear.
    Schlagwort(e): SOLAR PHYSICS
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 9
    facet.materialart.
    Unbekannt
    A brief introduction to coronal 'loops' (1990)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: A discussion is presented of elementary aspects of the physics of coronal loops, in order to more securely approach the question of their existence. It is noted that the time-scales for pressure equilibration are far shorter than typical cooling times in loop structures, and that the loop structures are accordingly in pressure balance with their surroundings. Those surroundings, however, are dark, implying a decreased density and gas pressure outside the bright loops. It is deduced that the loop interiors must have a weaker magnetic field than the gas immediately outside them.
    Schlagwort(e): SOLAR PHYSICS
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 10
    facet.materialart.
    Unbekannt
    Solar flares (1990)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: General characteristics of solar flares are discussed. They are a spectacular energy release arising from development of magnetic strain and shear, resulting from eruption of new magnetic flux near old. The release of magnetic energy is channeled into hard electrons (and possibly nucleons), which produce a series of other effects. The ultimate source of the magnetic complexity that produces flares is deep in the sun. A number of examples is given, and the difference between various types of flares is discussed.
    Schlagwort(e): SOLAR PHYSICS
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...